The reason, why Natsumi don't like this boss is good enough in terms of arguments. I actually really like this boss and it's definitely a big progression comparing to previous ones, that had more hard to dodge patterns or more hits. There's people who don't like this kind of boss, because these patterns can be very repetitive or even frustrating. Aiming people with content with hard difficulty is very hardcore to execute it properly - I know it from many failures from the past. It's totally fine, when people don't like something, even that is good, when they have solid arguments. Don't treat it as something rude, rather as a hint to sometimes change the style of the boss. Have a good day people and chill out!